HIGH-TEMPERATURE SUPERCONDUCTOR ARRANGEMENT

摘要

Layered ceramic high-temperature superconductors which are intended to be used as current limiters in alternating-current lines should have a bypass layer whose electrical resistivity is increased by more than 10 times with respect to that of the pure noble-metal bypass layer. Preferably, a base-metal bypass layer of steel whose electrical resistivity is in the range between 10 .mu..OMEGA.2 .times. cm and 100 .mu..OMEGA. .times. cm at 77 K is soldered on or bonded to the superconductor layer. For electrical and thermal reasons, it is essential that the sheet resistance .rho.3/d3 of the base-metal bypass layer satisfies the following equation: (see formula I)